Banner system
First Manchu invasion of Korea
Manchu conquest of China
Second Manchu invasion of Korea
Revolt of the Three Feudatories
Ten Great Campaigns
First Opium War
Second Opium War
Taiping Rebellion
Boxer Rebellion
The Eight Banners (in Manchu: 
jakūn gūsa, Chinese: 八旗; pinyin: bāqí) were administrative/military divisions under the Qing dynasty into which all Manchu households were placed. In war, the Eight Banners functioned as armies, but the banner system was also the basic organizational framework of all of Manchu society. Created in the early 17th century by Nurhaci, the banner armies played an instrumental role in his unification of the fragmented Jurchen people (who would later be renamed the Manchus under Nurhaci's son Hong Taiji) and in the Qing dynasty's conquest of the Ming dynasty. As Mongol and Han forces were incorporated into the growing Qing military establishment, the Mongol Eight Banners and Han Eight Banners were created alongside the original Manchu banners. The banner armies were considered the elite forces of the Qing military, while the remainder of imperial troops were incorporated into the vast Green Standard Army. Membership in the banners became hereditary, and bannermen were granted land and income. After the defeat of the Ming dynasty, Qing emperors continued to rely on the Eight Banners in their subsequent military campaigns. After the Ten Great Campaigns of the Qianlong Emperor, the quality of banner troops gradually decreased, and by the 19th century the task of defending the empire had largely fallen upon regional armies such as the Xiang Army. Over time, the Eight Banners became synonymous with Manchu identity even as their military strength vanished.
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Wikipedia